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The large-scale HM-ZvlC vertical quenching machine produced and sold by Mitsubishi Electric Corporation has a power supply frequency of 6000 Hz and a maximum stroke height of 4 m. It can quench a gear with a diameter of 4 m and a heavy weight. In the 1970s, the Wuhan Heavy Machinery Plant produced a WIG: type gear quenching machine that can handle gears with a maximum modulus of 5 nn and a weight of 4 tons, but its indexing mechanism is relatively backward. In the same period, Dalian Locomotive Works and Xiangtan Motor Factory made and produced a special oil-buried quenching machine for traction driven gears, which can handle gears with a modulus of 12m: 63 teeth, 180mm tooth width, 42CrM material, and double-tooth oil quenching. sensor.
In the 1980s, Zhengzhou Machinery Research Institute designed and produced a fully functional CNC gear induction hardening machine for the production of heat treatment plant in Taiyuan Heavy Machinery Plant. Since then, China has produced its own advanced gear induction hardening machine, which is encouraging! Sensor design issues related to single-tooth continuous induction hardening have also been resolved.
According to the user's report, the machine is reliable in performance, and it is characterized by no top-notch and no excess function, thus reducing the cost. The main technical data of the machine tool: maximum quenching gear diameter 300m, maximum quenching length 900; Ilm, maximum modulus 40mm, gear helix angle 5o30, gear maximum weight 10t, sensor moving speed 1-10mm/s, machine tool drive power capacity skw, gear Automatic indexing (numerical control).
In 1984, Dalian Locomotive Works and other units used 8000H, medium frequency power supply to quench the locomotive gears with 60DTi (or 70DTi) low-hardening system and modulus of 7-12mm, and planned to replace 42CrMo and ZoerMnM. alloy steel. Later, a high-power intermediate frequency power supply (50kw, 2500Hz) was purchased, and industrial production of the large traction driven gear of low-hardened steel was planned, but this work was soon stopped. Xi'an Special Power Research Institute provides complete sets of equipment for the surface quenching of the ring gear of the Yellow River Engineering Machinery Plant with a size of 692mmx118mm and a modulus of 12mm. The ring gear heating parameters are as follows: intermediate frequency voltage 700V, DC voltage 475-500V, power 575kw, frequency 2420Hz, DC current 900-1400A, lbJ1min30s when heating, heating temperature 1000°C (tooth root 3mm). In addition, the plant also provided similar equipment for Qinghai Gear Factory.
The cost of using an intermediate frequency ferrule rotary induction hardening system is very high, and manufacturers cannot easily launch if they do not have enough gear batches. In addition, it is also considered that the above process is employed, and since the heated portion of the gear is increased, the hardness of the tooth surface is not easily removed. For this reason, Bedinghouse has proposed a steel with a high carbon content such as C53 (equivalent to 5 steel) and 50CrM. In the manual of the gear off, the maximum size of the gear for medium frequency heating rotary quenching is 400mx150m, which seems to be necessary to be corrected. Under single-piece small batch production conditions, flame quenching still has a certain vitality. At present, there are still 219 specialized heat treatment plants in the United States that use flame quenching technology as a proof.
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